NEHRP Clearinghouse
- Title
- Filter Circuit Board for the Earthworm Seismic Data Acquisition System.
- File
- PB2006105398.pdf
- Author(s)
- Jensen, E. G.
- Source
- January 2000, 22 p.
- Identifying Number(s)
- USGS/OFR-00-379
- Abstract
- The Earthworm (EW) system is a seismic network data acquisition and processing system developed by the U. S. Geological Survey, Earthquake Hazards Team (USGS, EHZ) and Dr. Carl Johnson during the 1990's. It is used by the Northern California Seismic Network (NCSN) as well as many other networks including the Hawaiian Volcano Observatory, the Alaska Volcano Observatory, the Southern California Seismic Network, and others. The input to the EW system is comprised of many realtime electronic seismic waveforms fed to a multichannel digitizer on a PC platform. For systems with more than 16 channels, the digitizer consists of one, two or four 64-channel multiplexer boards (National Instruments Corp. AMUX-64T) attached to an A/D converter board located in the computer.
- Keywords
- Multi-channel digitizer; Seismic networks; Filter circuits; Photographs; Data acquisitions; Specifications; Schematics; Diagrams; Earthworm (EW) system; Processing system; Seismic waveforms